blk_queue_ordered(9) suse man page | unix.com

BLK_QUEUE_ORDERED(9)						   Block Devices					      BLK_QUEUE_ORDERED(9)

NAME
       blk_queue_ordered - does this queue support ordered writes

SYNOPSIS
       int blk_queue_ordered(struct request_queue * q, unsigned ordered, prepare_flush_fn * prepare_flush_fn);

ARGUMENTS
       q
	   the request queue

       ordered
	   one of QUEUE_ORDERED_*

       prepare_flush_fn
	   rq setup helper for cache flush ordered writes

DESCRIPTION
       For journalled file systems, doing ordered writes on a commit block instead of explicitly doing wait_on_buffer (which is bad for
       performance) can be a big win. Block drivers supporting this feature should call this function and indicate so.

COPYRIGHT
Kernel Hackers Manual 2.6.					     July 2010						      BLK_QUEUE_ORDERED(9)